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He played a key role in the refinement and balance of the Basic Roleplaying system, which makes him one of the crucial designers of RuneQuest and Call of Cthulhu, as well as the other lesser lights driven by BRP. He also co-designed the Ghostbusters RPG, which is the second-best licensed RPG ever created, and incidentally provided the die pool architecture for Shadowrun and for the White Wolf Storyteller engine.

He also played a key role as shepherd and guardian of Call of Cthulhu for its first twenty years.